How severe is CVE-2026-34659?

CVE-2026-34659 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-34659 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34659?

CVE-2026-34659 primarily affects Adobe Connect Desktop Application. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-34659?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-34659 have an EU (EUVD) identifier?

Yes. CVE-2026-34659 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29740.

When was CVE-2026-34659 published?

CVE-2026-34659 was published on 2026-05-12 and last updated on 2026-06-17.

CVE-2026-34659

CVE-2026-34659 is a critical-severity vulnerability in Adobe Connect Desktop Application with a CVSS 3.x base score of 9.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.6)
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29740
Weakness: CWE-502
Affected product: Adobe Connect Desktop Application
Published: 2026-05-12
Last modified: 2026-06-17

Description

Adobe Connect versions 2025.9.15, 2025.8.157 and earlier are affected by a Deserialization of Untrusted Data vulnerability that could result in arbitrary code execution in the context of the current user. An attacker could exploit this vulnerability to execute arbitrary code. Exploitation of this issue requires user interaction in that a victim must visit a maliciously crafted URL or interact with a compromised web page. Scope is changed.

Frequently asked questions

What is CVE-2026-34659?: Adobe Connect versions 2025.9.15, 2025.8.157 and earlier are affected by a Deserialization of Untrusted Data vulnerability that could result in arbitrary code execution in the context of the current user. An attacker could exploit this vulnerability to execute arbitrary code. Exploitation of this issue requires user interaction in that a victim must visit a maliciously crafted URL or interact with a compromised web page. Scope is changed.
How severe is CVE-2026-34659?: CVE-2026-34659 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-34659 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34659?: CVE-2026-34659 primarily affects Adobe Connect Desktop Application. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-34659?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-34659 have an EU (EUVD) identifier?: Yes. CVE-2026-34659 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29740.
When was CVE-2026-34659 published?: CVE-2026-34659 was published on 2026-05-12 and last updated on 2026-06-17.

References

https://helpx.adobe.com/security/products/connect/apsb26-50.html

Affected products (2)

cpe:2.3:a:adobe:connect_desktop_application:*:*:*:*:*:macos:*:*
cpe:2.3:a:adobe:connect_desktop_application:2025.9.15:*:*:*:*:windows:*:*

More vulnerabilities in Adobe Connect Desktop Application

CVE-2026-27303 — Critical (CVSS 9.6): Adobe Connect versions 2025.3, 12.10 and earlier are affected by a Deserialization of Untrusted Data vulnerability that…
CVE-2025-27203 — Critical (CVSS 9.6): Adobe Connect versions 24.0 and earlier are affected by a Deserialization of Untrusted Data vulnerability that could…
CVE-2026-34660 — Critical (CVSS 9.3): Adobe Connect versions 2025.9.15, 2025.8.157 and earlier are affected by an Incorrect Authorization vulnerability that…
CVE-2026-34615 — Critical (CVSS 9.3): Adobe Connect versions 2025.3, 12.10 and earlier are affected by a Deserialization of Untrusted Data vulnerability that…
CVE-2026-27246 — Critical (CVSS 9.3): Adobe Connect versions 2025.3, 12.10 and earlier are affected by a DOM-based Cross-Site Scripting (XSS) vulnerability.…
CVE-2026-27245 — Critical (CVSS 9.3): Adobe Connect versions 2025.3, 12.10 and earlier are affected by a reflected Cross-Site Scripting (XSS) vulnerability.…

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